A Chebyshev transform of the first kind of the Catalan numbers.

Terms

a(0) =1a(1) =1a(2) =0a(3) =2a(4) =8a(5) =22a(6) =64a(7) =198a(8) =624a(9) =1994a(10) =6464a(11) =21210a(12) =70296a(13) =234990a(14) =791424a(15) =2682894a(16) =9147360a(17) =31347730a(18) =107919232a(19) =373055730a(20) =1294372008a(21) =4506163718a(22) =15735793088a(23) =55105084246a(24) =193471595344a(25) =680891484762